Only when the war was over ____ to his home town.

A.did the young soldier return

B.the young soldier returned

C.returned the young soldier

D.the young soldier did return

答案及解析： A

解析：

考查倒装句。Only引导部分倒装句有两个条件：1.only要放在句首；

2. only后面强调状语。本句符合要求。故A正确。